CEL and Traction Control light - P0171

[Jedistylez]

So I recently just installed an aftermarket over pipe and UEL headers and didn’t have any issues at first, however after about a day or two the CEL and TCS light came on and I am unable to turn off the TCS light. I also installed a CAI but put the stock intake back thinking it might have been that. My LTFT percentage is way too high at 37% when idle but goes down to normal percentage range when driving. Could this be from an exhaust leak/vacuum leak? It’s a 2017 auto.

[Opie]

Are you absolutely sure there are no exhaust leaks from the header or overpipe install? Or the intake fiddling? If not, was the car tuned for the headers & overpipe?

[tomm.brz]

high probability of exhaust leak near the front o2 sensor
stock tune with stock airbox won t give +35% or more of ltft just for exhaust header unless the front lambda is measuring some fresh air

[Jedistylez]

Originally Posted by Opie

Are you absolutely sure there are no exhaust leaks from the header or overpipe install? Or the intake fiddling? If not, was the car tuned for the headers & overpipe?

I’m sure I tightened everything well but there might be an exhaust leak. I’ll have to check it out to be sure but I used an OFT2 stage 2 plus tune for the headers. It’s only high when idling but when driving the percentages are normal.